Web-loading GUI: Update OK button

[btbest]

Just a tiny improvement to the dialog for choosing a URL. Currently, the user first has to "Check URL", and if the URL gives a successful response, the Ok button is activated. If the user then changes the URL, the button remains activated and the user can add any arbitrary string to the project (which will attempt to fetch from there and fail).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 55.74%. Comparing base (126b3e1) to head (63f99ff).
Report is 14 commits behind head on main.

Files	Patch %	Lines
.../applets/dataSelection/precomputedVolumeBrowser.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2851      +/-   ##
==========================================
- Coverage   55.75%   55.74%   -0.01%     
==========================================
  Files         533      533              
  Lines       62207    62213       +6     
  Branches     8511     8512       +1     
==========================================
+ Hits        34681    34683       +2     
- Misses      25767    25777      +10     
+ Partials     1759     1753       -6     

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[k-dominik]

Works!

Behavior on enter is interesting:

• if URL is not checked, enter performs check url. if URL has been successfully checked, next enter accepts.
• editing (e.g. adding a character), enter (unsuccessful check) -> the Unknown error while trying to connect to this address.... shows up, which is correct.
• editing (removing character from before), Add to project becomes enabled immediately, text field doesn't change (still the Unknown error) - one enter here directly adds the data.

it's a tiny bit inconsistent.

[btbest]

Thanks for noticing 🤦